In a frying pan or cast iron add oil to medium heat. Add beef strips and saute until beef becomes dark brown.
After sauteing beef strips, add 1 cup of water and cover the skillet with foil and put into the oven on 350 degrees for 30 mins or until beef is tender.
In a skillet or wok add oil and saute garlic first for a few seconds, then add mushrooms, carrots, onions, bell peppers, and broccoli and continue stirring. (No more than 2 mins)
Add cooked beef to the pan with veggies and stir continuously under medium to high heat.
Add sesame seed oil and hoisin sauce and stir constantly for a few seconds.
Add salt and pepper to taste.
After stir frying the veggies add the scallions
Garnish with sesame seed (Optional)